Wash strawberries, remove the stems and cores, and slice. Place 2 cups of sliced berries in a bowl and set the remaining slices aside.

Mash the 2 cups of sliced berries in the bowl and then pour into a sauce pan. Add the sugar, water, and cornstarch and cook over medium heat until mixture is boiling. Allow to boil for 1 minute or until sauce begins to thicken. Stir constantly while cooking. After mixture has thickened, add the remaining strawberries, gently stirring until they are evenly distributed.